"The third attack on the site since midnight is still underway," Kurir said on its Twitter profile on Tuesday afternoon.
BIRN has learned from the newspaper that its hosting service was trying to thwart the attacks, but they were very powerful.
The reason for the hacker assault is so far unclear.
President Tomislav Nikolic on Friday called for changes in the police, saying they were needed to support the fight against crime in the country.
"I call on the government to appoint honest crime fighters and ensure that those responsible are doing the job they are entrusted with," Nikolic said.
BELGRADE - The results of the polygraph test taken by Head of the Criminal Police Directorate (UKP) Rodoljub Milovic show no psychophysiological responses to relevant questions that would indicate that the examinee is not telling the truth, Serbian Interior Minister Nebojsa Stefanovic said on Thursday.
Police official "taking lie detector test"
BELGRADE -- Criminal Police Administration (UKP) chief Rodoljub Milović is on Wednesday taking a polygraph test, as announced by Interior Minister Nebojša Stefanović.
Stefanović added that he had formed a working group to investigate all allegations that Darko Šarić presented as part of his defense.